Machine for grinding handles of table-knives



(No Model.) 3 Sheets-Sheet l 0.3. ROBERTS. MACHINE FOR GRINDING HANDLES. 0F TABLE KNIVES.

No. 554,797. Patented Feb. 18, 1896 I N 6HARLESE/%5ERTJ 2/ BL W,MTfi M /L ANDREW BIGRANAMIPHOTO-UTHOVWKSHlNGIUNDL 3- She-ets-Sheet 3. c. E.- ROBERT-S.

Patented Feb. 18, 1896;

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MACHINE FOR GRINDING HANDLES 0F TABLE KNIVES UNrTED STATES PATENT OFFICE.

CHARLES E. ROBERTS, OF OAK PARK, ASSIGNOR TO THE NATIONAL OUTLERY COMPANY, OF ROCKFORD, ILLINOIS.

MACHINE FOR GRINDING HANDLES OF TABLE-KNIVES.

SPECIFICATION forming part of Letters Patent No. 554,797, dated. February 18, 1896. Application filed F bruary 11, 1895. Serial No. 538 ,039. (N0 model.)

To aZZ whom it may concern:

Be it known that 1, CHARLES E. ROBERTS, a citizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Machines for Grinding Handles of Table-Knives, of which the following is a specification.

This invention relates to improvements in.

machines for grinding the handles of table knives.

The nature of the invention is fully set forth below and illustrated in the accompanying drawings, in which Figure 1 is a plan of the machine; and Figs. 2,3, and 4 are sectional views on the lines 2 2, 3 3, and 4 4, respectively. Fig. 5 is a longitudinal section of the chuck.

In said drawings, A represents a suitable grinding-wheel journaled in the bearing A and driven by the pulley A The bearing is supported upon pivoted standards A which are controlled by a screw A and aspring A this construction permitting the bearing to be adjusted toward the work as the wheel becomes reduced in diameter.

The knife-blank shown atW is held at one end in a rotating chuck or head B, supported in a head-stock B, and at the other end by a rotating center O, held in a tail-stock O, and

both the chuck and center stock are mounted upon a carriage D, which is capable of a longitudinal movement to carry the handle from end to end past the grinder, and also of a rocking motion, so that the blank may be moved toward and away from the Wheel and thus allow for the oval shape of the cross-section of the handle.

The chuck B is provided with. rocking clamping arms B which are adapted to grasp the bolster portion of the blank upon the broader sides thereof, and are forced into action by the sliding stepped cone B which enters between the rear ends of the arms and spreads them. The cone is moved forward in this operation by the hand-lever B and the pivoted-yoke l3 connecting the lever with the cone and having trunnions 13 working in a groove B in the cone. (The cone is loose upon the shaft of the chuck.) Rotary motion is communicated to this chuck by the pulley B and belt B from the pulley G.

The other end of the knife-blank carries a tang V, formed upon the outer end of the handle at the time the blank is forged, and this tang is inserted in the rotatable centering device 0. The center is movable in both directions by a rocking cam 0 operated by a hand-lever The lever enables the operator to apply considerable power when that is necessary to insure a firm seating of the tang in the center. The center is encircled by a sleeve 0 in which it has freedom to rotate and which moves with it in its longitudinal movements. The spring G and pin O press against the outer end of the center and thus serve to counteract any tendency by the hand-lever to turn the cam by gravity.

.Both the head-stock and the tail-stock are supported upon the carriage D, as is also the yoke B An outer bearing 13 is provided for the shaft of the chuck and its pulley, and such bearing is also supported upon the carriage. The carriage is itself supported and both slides and rocks upon a stationary shaft E, sustained in a wide bearing E upon the main frame. Bushings E encircle the shaft at the points where the carriage is joined to it. The rocking of the carriage permits the blank-holding device to be moved toward or away from the grinding-wheel, so that the grinding may impart the oval shape desired for the handle. This rocking movement is caused by the contact of the rotating form F, also j ournaled upon the carriage and rotated by the gears F F, the latter upon the journal of the chuck, with the stationary roller F supported upon a standard F The carriage is maintained in position with the form in constant contact with the roller by springpressure caused by the spring F encircling the stem of and acting upwardly upon a plunger F carrying an antifriction-roller F against a projecting arm F upon the side of the carriage opposite to that upon which the form is located.

The sliding or longitudinal movement of the chuck-carriage is caused by the following mechanism: The pulley G,already mentioned, from which power is carried to the chuckpulley, is attached to and moves with another pulley, G, and both are loosely supported upon a shaft ll. Secured in the web of pulley G is a stubshaft or pivot H, upon which are rotatably mounted two pinions H 11 secured together or made in one piece so as to move together. Of these pinions that lettered ll meshes with a stationary or non-rotating gear ll" secured to the frame of the machine, while pinion H meshes with a gear H splined upon shaft II. The gears ll' and ll are of the same diameter, but the former has a tooth or two more than the latter. From this construction it will be seen that by the rotation of the pulley Jr the pinions are carried around the gears, and as one of the latter is stationary the pinions are necessarilyrotated, and thereby motion is transmitted to gear ll to the OK- tent of the di'lterence in the number of teeth in the gearsthat is to say, gear 11 will be actuated each time the pinions travel around it the distance or space of one tooth or other number of teeth which said gear possesses over gear II". This causes a very slow rotation of shaft II, which I utilize as a means whereby to obtain the sliding movements of the carriage by providing the shaft with a peripheral cam ll and the carriage with the antifrietion-roller Il adapted to be engaged by such cam. The return movements of the carriage are caused by a weight J, which also keeps the roller normally in contact with the cam.

The machine is adapted to polish all of the handle of the knife except the rounded outer end, and its operation will be fully understood from what has already been given in the above description.

I claim- 1. The combination in a cutlery-grinding machine of a grindin g-wheel, a rotating chuck B movable pressure-exerting levers, means for throwin said levers into action, and a centering device C, adapted both to rotate and to slide, and a rocking cam for sliding it away from the knife-blank, and a spring for keeping itin action, substantiallyas specified.

2. The combination with the blank-holding devices and their sliding carriage, of the cam for actuating the carriage in its sliding movement, and the gearing for turning the cam, said gearing consistin of pinions ll lll and dilierential gears ll" ll, one of the latter be ing stationary, substantially as specified.

The combination with the carriage and the cam for sliding it, of pulley G, pinions II 11 and diilerential gears H 11 one of the latter being splined to the cam-shaft and the other being held stationary, substantially as specified.

at. The combination of the rotary blankholding devices and the sliding carriage upon which said devices are mounted, with the shaft E supporting the carriage and upon which it rocks, and means for sliding the earriage upon the shaft, substantially as specilied.

5. The combination of the rotary blankholding devices and the sliding carriage upon which said devices are mounted, with the shaft E supporting the carriage and upon which it rocks, means for sliding the carriage upon the shaft, and the form and opposing sprin for rocking the carriage, substantially as specified.

6. The combination with a rotating chuck, a rotating form located alongside the chuck, and a rocking an d sliding carriage upon which both chuck and form are supported, of a stationary roller bearing against the form in any position of the carriage and a spring device actin upon the carriage and serving to keep the form against the roller, substantially as specified.

7. The combination with a rotating chuck, a rotating form, located at the side of the chuck, and a rocking carriage upon which both chuck and form are supported, of means for rotating the chuck and form at a similar speed, a stationary rollcrbearingagainst the form, and a spring device acting upon the carriage and serving to keep the form against the roller, substantially as specified.

8. The combination with arotating chuck, a rotating form at the side of the chuck, intermeshing gears upon the chuck and form, and a rocking carriage upon which both chuck and form are supported, of a stationaryroller bearingagainst the form, and a spring device acting upon the carriage and serving to keep the form against the roller, substantially as specified.

CHARLES E. IUHHCR'IS.

\Vitnesses:

CHARLES ll. RoLLINs, lllICHAEL W. GILTINON. 

